You mean currency, as you cannot buy online with cash…. YES, they convert the foreign currency into US dollars automatically, as your bank will only pay in US dollars. You usually get screwed on the exchange rate, all online sellers offer a rate about 5% to 10% worst than the actual bank exchange rate. I purchased a laser printer for a relative in Romania, and they charged me 3.48 Lei for $1, when in fact the exchange rate was 3.56. I paid $88 instead of $86.